package/quagga: fetch from sources.buildroot.net

Fixes https://autobuild.buildroot.org/results/54a/54a165827f536be47cd45c98da3937a1e94a7c65/

Upstream is no longer accessible, so use s.b.n instead.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Julien Olivain <ju.o@free.fr>

package/quagga/quagga.mk

@@ -5,7 +5,8 @@
 ################################################################################
 
 QUAGGA_VERSION = 1.2.4
-QUAGGA_SITE = http://download.savannah.gnu.org/releases/quagga
+# upstream (http://download.savannah.gnu.org/releases/quagga) dead
+QUAGGA_SITE = http://sources.buildroot.net/quagga
 QUAGGA_INSTALL_STAGING = YES
 QUAGGA_DEPENDENCIES = host-gawk host-pkgconf
 QUAGGA_LICENSE = GPL-2.0+